I’m not sure we share the same definition of “usable”. Like, yeah, the arranger works, but it hardly offers anything as usable as a linear timeline like @Uija is used to in Ableton. Also, there are problems with it. The mutes behave inconsistently with how they behave when switching patterns, you have to meticulously count the bars for each section of the arrangement, and someitimes if you’re mixing patterns of different lenghts, then conditional trigs don’t work how you intend. For example, if I have a 16-bar pattern with a conditional trig on the last repitition of that pattern, but it comes after a middle-8 in my arrangement, that conditional trig will hit halfway through because it’s counting from the beginning of the arrangement, not the beginning of the pattern. There’s also no way to fix that at all; no workaround.
The arranger is not usable, but it will suffice if you really need it. I decided not to use it for the most part because of issues like the above, in addition to the fact that programming it is just quite tedious and involves a lot of counting.